SessionFactory单例示例代码

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这段代码是hibernate5.02版本写的。

package com.mxf.test;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.MetadataSources;import org.hibernate.boot.registry.StandardServiceRegistry;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;/** * 采用饿汉模式设计该类 * */public class HibernateUtils {private HibernateUtils() {}private static HibernateUtils instance = new HibernateUtils();public static HibernateUtils getInstance() {return instance;}private SessionFactory sessionFactory;private StandardServiceRegistry standardServiceRegistry;private Transaction tx;private Session session;public SessionFactory getSessionFactory() {if (sessionFactory == null) {standardServiceRegistry = new StandardServiceRegistryBuilder().configure().build();sessionFactory = new MetadataSources(standardServiceRegistry).buildMetadata().buildSessionFactory();}return sessionFactory;}/** * 得到线程安全的session * @return */public Session getSession() {session = getSessionFactory().getCurrentSession();return session;}public Transaction getTx() {tx = getSession().beginTransaction();return tx;}public void commitTx() {tx.commit();session.close();}}

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